Fluorescein angiography

Definition

Fluorescein angiography is an eye test that uses a special dye and camera to look at blood flow in the retina and choroid, the two layers in the back of the eye.

Alternative Names

Retinal photography; Eye angiography

How the test is performed

Eye drops that make the pupil dilate will be given. You will be asked to place your chin on the camera's chin rest and your forehead against a support bar to keep your head still during the test.

The health care provider will take pictures of the inside of your eye. After the first group of pictures are taken, a dye called fluorescein is injected into a vein, usually at the bend of your elbow. Then, a special camera takes pictures as the dye moves through the blood vessels in the back of your eye.

How to prepare for the test

You will need someone to drive you home, because your vision may be blurred up to 12 hours after the test.

You may be told to discontinue drugs that could affect the test results. Tell your health care provide about any allergies, particularly reactions to iodine.

You must sign an informed consent form. You must remove contact lenses before the test.

Tell the health care provider if you may be pregnant.

How the test will feel

When the needle is inserted, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.

When the dye is injected, you may have mild nausea and a warm sensation. These symptoms are usually very brief.

The dye will cause your urine to be darker, and possibly orange in color, for a day or two after the test.

Why the test is performed

This test is done to see if there is proper blood flow in the blood vessels in the two layers in the back of your eye (the retina and choroid).

It can also be used to diagnose problems in the eye or to determine how well certain eye treatments are working.

Normal Values

A normal result means the vessels appear a normal size, there are no new abnormal vessels, and there are no blockages or leakages.

What abnormal results mean

If blockage or leakage is present, the pictures will map the location for possible treatment.